Incinerator stoker grate and trunnion assembly

ABSTRACT

An incinerator stoker grate and trunnion assembly having rows of rocking grates journaled upon pillow blocks mounted upon supporting structures. Trunnion pins are clamped between the pillow blocks and their caps. Each grate has longitudinally disposed apertures in its ends and bushings located in said holes to receive the trunnion pins.

United States Patent 1 1 3,563,190 72 Inventors DonaldLSprague [51] Int. Cl F231: 1/22 1 Massillon; [50] Field ofSearch 110/38, 39; Jouph F. Stengieiu, Center-ville; Glenn T. 126/176 Dubs Canton, Ohio 21 Appl. No. 849,942 [5 1 References cm [22] Filed Aug. 12, 1969 UNITED STATES PATENTS [45] Patented Feb- 6, 1971 2,471,659 5/1949 Simon 3., 126/176 Assignee Canton Stoker Corpor i 3,266,447 8/1966 Turnerleta 110/39 Canton, Ohio 1 V 1 Przmary Exammer-EdWard G. Fayors 1 nomination Ohio Attorney-Frease8zBishop ABSTRACT: An incinerator stoker grate and trunnion as- [54] INCINERATOR STOKER GRATE AND TRUNNION spmbly haviggrmws of rockiggs jqumaued upomplllow ASSEMBLY blocks mounted upon supporting structures Trunmon pms 90mm 11 Dnwhsngs are clamped between the pillow blocks and then caps Each [52] U.S.Cl grate has longitudinally dlsposed apertures 1n its ends and I4 a 1' y PATENTEUFEB 1 s |97| 3.563.190

SHEET 1 BF 2 INVI'JN'I'ORS.

ATTORNEYS INCINERATOR STOKER GRATE AND TRUNNION ASSEMBLY BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to incinerator stokers in which successive rows of rocking grates are journaled upon structural members. Means is provided for rocking alternate rows of grates to intermittently feed refuse and garbage forwardly upon the grates from the area of the charging chute to the discharge end of the stoker incinerator.

2. Description of the Prior Art Such grates are usually formed with integral trunnions at their ends. These trunnions are joumaled in bearing blocks mounted upon the supporting structure. When these trunnions become worn by use, the entire grate must be discarded and replaced.

SUMMARY OF THE INVENTION In general terms, the invention may be briefly described as comprising a grate-and-trunnion assembly for an incinerator stoker. The assembly includes'a grate having a longitudinally disposed hole in each end and a bushing fixed in each hole.

The bushing may be made of different materials, for instance, to withstand friction without exposure to excessive heat and of a different material to withstand friction at high heat. As examples, a bronze bushing may be used in the cold zone, a ductile iron bushing in the heat zone, and another type of bronze, cast iron, or the like in the cooling zone.

A pillow block is located at each end of the grate and has a trunnion pin located therethrough and into the adjacent bushing. The trunnion pin is a heavy duty alloy shaft or tube with an annular shoulder such as a washer welded onto one end.

There is an annular groove near one end of the opening in the pillow block and cap for receiving the washer and holding the trunnion pin secured in the pillow block.

As a modification of the invention, a tubular adapter may be threaded into each end of the grate and the bushings located in these adapters. Or such adapters may be connected to the grate by screws.

The cap may be attached to the pillow block by cap screws and the pillow block may be attached to the supporting structure by bolts and nuts. Or as an alternative, holes may be drilled through the cap and base of the pillow block and I through the supporting structure, and a square head nut put through with a nut on the underside of the structural support flange.

A primary object of the invention is to provide an incineratorstoker grate-and-trunnion assembly comprising a grate and pillow blocks at opposite ends of the grate with trunnion pins upon which the grate is journaled.

Another object of the invention is to provide such a grateand-trunnion assembly in which removable bushings are located in the ends of the grate, the trunnion pins being located in said bushing.

A further object of the invention is to provide a grate-andtrunnion assembly of the character referred to in which the trunnion pins have washers welded to one end and the interiors of the pillow blocks have annular grooves receiving said washers.

A still further object of the invention is to provide a grateandtrunnion assembly of this type in which a tubular adapter is located in each end of the grate, the bushings being inserted in said adapters.

Another object of the invention is to provide such a grateand-trunnion assembly in which the caps are attached to the pillow blocks by capscrews and the bases of the pillow blocks are bolted to the structural supports.

A further object of the invention is to provide a grate-andtrunnion assembly of the character referred to in which the pillow block is of double width and the trunnion is of double length with a washer welded around the same intermediate its length, the ends of the pin protruding from opposite sides of the pillow block for insertion into bushings in the ends of opposed grates.

A further object of the invention is to provide a grate-andtrunnion assembly of this type in which holes are drilled through the cap and base of the pillow block and through the support structure and a squarehead bolt is put through the holes with a nut on the other side of the support flange.

These and other objects, apparent from the drawings and following description, may be attained, the above described difficulties overcome and the advantages and results obtained, by the apparatus, construction, arrangement and combinations, subcombinations and parts which comprise the present invention, preferred embodiments of which, illustrative of the best mode in which applicants have contemplated applying the principle, being set forth in detail in the following description and illustrated in the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagrammatic top plan view of a portion of a grate assembly for an incinerator stoker;

FIG. 2 is an enlarged fragmentary longitudinal section taken on the line 2-2, FIG. 1;

FIG. 3 is a detached perspective view of a grate;

FIG. 4 is an enlarged detached perspective view of a trunnion pin;

FIG. 5 is a fragmentary transverse section on the line 5-5, FIG. 2, showing one grate and the pillow blocks with trunnion pins upon which it is rotatably mounted, parts being broken away for purpose of illustration;

FIG. 6 is a top plan view of a pillow block with trunnion pin;

FIG. 7 is a section on the line 7-7, FIG. 6;

FIG. 8 is an enlarged fragmentary longitudinal section of one end portion of a grate with adapter therein in which the bushing is mounted;

FIG. 9 is a view similar to FIG. 8 in which is shown a modification of the adapter;

FIG. 10 is a longitudinal sectional view through a doublewidth pillow block with double length trunnion pin therein; and Y FIG. 11 is a transverse section through a modified form of pillow block.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention relates to large incinerator stokers for industrial and municipal use for burning garbage and refuse. lncinerator stokers of this type have a continuous grate bed formed of alternate rows of pivotally mounted grates with means for rocking the alternate rows to intermittently feed refuse and garbage forward from a cold zone, where it is charged onto the grates, through a hot zone and then a cooling zone.

Each row is made up of a plurality of individual grates, each of which is ordinarily provided at its ends with integral trunnions journaled in bearing blocks mounted upon the usual structural supports. As these trunnions take the wear of the grate pivoting on the bearing blocks, in time they become so worn that the entire grate must be discarded.

The present grate with bushings inserted in each end and pivoted upon trunnion pins overcomes the necessity of discarding the entire grate. When the bushings are worn, they may be replaced and the grate continued in use.

Each grate is indicated generally at 1. As best shown in FIG. 3, the grate has a flat face 2 and an arcuate face 3. Each grate is provided on one side with ears 4 to which reciprocating bars 5 may be pivotally attached as indicated at 6.

An opening 7 is formed in each end of each grate to receive a bushing 8 having an annular flange 9 at its outer end. This bushing may be formed of different materials depending upon the location of the particular grate in the incinerator stoker. One material such as bronze may be used for a bushing in the cold section of the incinerator to withstand friction without exposure to excessive heat while a different material such as ductile iron may be used for the bushings in the grates in the hot zone to withstand friction at high heat. A different type of bronze, cast iron or the like, may be used for the bushings in the cooling zone of the incinerator.

The flange 9 at the end of the bushing is provided to prevent the bushing from working its way out'of the opening 7 in the grate. Each bushing may be pinned into the grate so that it will not rotate. Any usual and well known means may be provided such for instance as the pin 10 shown in FIG. 5.

Each grate is pivoted upon trunnion pins supported at each end of the grate. For this purpose pillow blocks 11 are mounted on the I-beams 12 or other structural supports for the incinerator.

Trunnion pins 13, which may be formed of heavy duty alloy steel shaft or tube are supported in the pillow blocks and extend outwardly therefrom into the bushings 8. A shoulder is formed upon one end of each trunnion pin 13. The shoulder may be in the form of a washer 14 welded as at 15 to the end of the pin 13. The washer 14 fits within an annular groove 15 formed in the pillow block 11 and the cap 16 therefor.

As shown in FIGS. 6 and 7, the cap 16 is mounted upon the pillow block 11 by capscrews l7. Lugs 18 are formed at each end of the pillow block and have apertures 19 formed therethrough registering with apertures 20 in the flange 21 of the I-beam l2. Bolts 22 are located through these apertures and nuts 23 are provided upon the ends of the bolts below the flange 21 to attach the pillow block to the I-beam.

As shown in FIGS. 1 and 2, rows of stationary grates 24 are located between the rows of pivoted grates 1, being attached to the flanges 21 of the l-beams 12 by bolts 25.

Filler blocks 26 are located at the ends of the pivoted grates 1 between the pillow blocks 11 and the stationary grates 24, and are attached to the flanges 21 of the l-beams 12 by bolts 27. A spillover grate 28 may be located at the end of a section of the incinerator, as shown in FIG. 1.

Side fillers 29 are mounted upon the flanges 21 of the I- beams 12 on the outer sides of the pillow blocks 11 and filler blocks 26. Thus, a continuous surface is provided from one sidewali of the incinerator stoker to the other.

In FIG. 8 is shown a modification of the invention in which an adapter 30 is set into an opening 31 in the end of the grate I, the bushing 8 being inserted into the adapter. The flange 32 at the outer end of the adapter 30 is received in the recesses 33, and the adapter 30 is retained in the grate 1 by capscrews 34.

Another embodiment of adapter is shown in FIG. 9 in which the adapter 30a has screw threads 35 by means of which it is threaded into the end of the grate l, the bushing 8 being inserted into the hollow adapter.

A double width pillow block 36 is shown in FIG. 10 having a double-width cap 37 thereon. A double length trunnion pin 38 is located through the pillow block and has an annular shoulder in the form of a washer 3h welded intermediate its length. The washer 39 is received in an annular groove 40 in the pillow block 36 and cap 37.

The cap 37 may be attached to the pillow block 36 and the pillow block may be attached to the flange 21 of the I-beam 12 in the same manner as shown in FIG. 7 and above described.

One end of the trunnion pin 38 extends from each end of the double-width pillow block 36 so at to journal the ends of opposed grates thereon.

Instead of attaching the pillow block to the l'beam by separate bolts as best shown in FIG. 7, the cap may be attached to the pillow block by the same bolts that attach the pillow block to the I-beam, as shown in FIG. 11.

For this purpose, registering apertures 41, 42 and 43 are drilled through the cap 16, pillow block 11 and flange 21 of the I-beam 12. A squareheaded bolt 44 is located through these apertures, the head of the bolt being located in the socket 46 in the cap 16 and a nut 45 being located upon the threaded lower end of the bolt below the I-beam flange 21.

We clai m: 1. An incinerator stoker grate-and-trunmon assembly Including a grate having a longitudinally disposed aperture in each end, a bushing located in each aperture, a pillow block mounted at each end of the grate, and a trunnion pin carried by each pillow block and received in the adjacent bushing.

2. An incinerator stoker grate-and-trunnion assembly as defined in claim 1 in which there is an annular shoulder on the trunnion pin and a groove in the pillow block receiving said annular shoulder.

3. An incinerator stoker grate-and-trunnion assembly as defined in claim 2 in which said annular shoulder comprises a washer welded to the trunnion pin.

4. An incinerator stoker grate-and-trunnion assembly as defined in claim 1 in which the pillow block is double width and the trunnion pin protrudes from both ends'of the pillow block and forms journals for the opposed ends of two grates.

5. An incinerator stoker grate-and-trunnion assembly as defined in claim 1 in which the bushing is located in a tubular adapter inserted in each aperture in the grate.

6. An incinerator stoker grate-and-trunnion assembly as defined in claim 5 in which the adapter has a flange at its outer end and screws are located through said flange and into the adjacent end of the grate.

7. An incinerator stoker grate-and-trunnion assembly as defined in claim 5 in which the tubular adapter is threaded into said aperture.

8. An incinerator stoker grate-and-trunnion assembly as defined in claim 1 in which each pillow block comprises a base and a cap, and the bases are mounted on the top flanges of structural support members, and in which there are apertures drilled through the cap, base and top flange, and bolts are located through said apertures and nuts are located upon the lower ends of the bolts.

9. An incinerator stoker grate-and-trunnion assembly as defined in claim 8 in which the bolts have square heads located in sockets in the top of the cap. 

1. An incinerator stoker grate-and-trunnion assembly including a grate having a longitudinally disposed aperture in each end, a bushing located in each aperture, a pillow block mounted at each end of the grate, and a trunnion pin carried by each pillow block and received in the adjacent bushing.
 2. An incinerator stoker grate-and-trunnion assembly as defined in claim 1 in which there is an annular shoulder on the trunnion pin and a groove in the pillow block receiving said annular shoulder.
 3. An incinerator stoker grate-and-trunnion assembly as defined in claim 2 in which said annular shoulder comprises a washer welded to the trunnion pin.
 4. An incinerator stoker grate-and-trunnion assembly as defined in claim 1 in which the pillow block is double width and the trunnion pin protrudes from both ends of the pillow block and forms journals for the opposed ends of two grates.
 5. An incinerator stoker grate-and-trunnion assembly as defined in claim 1 in which the bushing is located in a tubular adapter inserted in each aperture in the grate.
 6. An incinerator stoker grate-and-trunnion assembly as defined in claim 5 in which the adapter has a flange at its outer end and screws are located through said flange and into the adjacent end of the grate.
 7. An incinerator stoker grate-and-trunnion assembly as defined in claim 5 in which the tubular adapter is threaded into said aperture.
 8. An incinerator stoker grate-and-trunnion assembly as defined in claim 1 in which each pillow block comprises a base and a cap, and the bases are mounted on the top flanges of structural support members, and in which there are apertures drilled through the cap, base and top flange, and bolts are located through said apertures and nuts are located upon the lower ends of the bolts.
 9. An incinerator stoker grate-and-trunnion assembly as defined in claim 8 in which the bolts have square heads located in sockets in the top of the cap. 